Backlight unit and display device including the same

Abstract

The present disclosure provides a backlight unit and a display device including the same. The backlight unit includes: a first substrate; a plurality of light sources arranged on one surface of the first substrate; a first reflective film arranged on one surface of the first substrate, including a first opening portion exposing each of the light sources; and a plurality of wavelength filter layers arranged on the first reflective film, corresponding to the first opening portion, the plurality of wavelength filter layers are arranged spaced apart from each other, and each wavelength filter layer covers at least one of the first opening portions.

Description

Technical Field

[0001] The present disclosure relates to a backlight unit and a display device including the same. Background Art

[0002] The liquid crystal display device displays an image after receiving light from a backlight unit. The backlight unit includes a plurality of light sources. The light emitted from the light sources is incident on the liquid crystal display panel through an optical film or the like.

[0003] Recently, in order to improve the brightness uniformity of liquid crystal display devices to ensure the appearance and reduce the thickness, the application of wavelength filter layers is being studied. The wavelength filter layer is formed by repeatedly stacking multiple refractive layers with different refractive indices, so that the transmittance varies according to the wavelength band and / or incident angle of the light entering the wavelength filter layer, thereby diffusing the light.

[0004] In the case of an edge-type backlight unit in which the light source is located at the side of the display panel, the diffusion plate is disposed above the light guide plate. In contrast, in the case of a direct-type backlight unit in which the light source is disposed below the display panel, the diffusion plate can be directly opposite to the light source. The thinner the thickness of the liquid crystal display device, the closer the distance between the light source and the diffusion plate will be. The closer the distance between the light source and the diffusion plate is, the more likely a hot spot will occur above the light source, thereby reducing the brightness uniformity. Summary of the invention

[0005] Technical issues

[0006] The technical problem to be solved by the present disclosure is to provide a backlight unit capable of saving material cost of a wavelength filter layer and / or increasing light diffusion to reduce an optical distance.

[0007] The technical problem to be solved by the present disclosure is to provide a display device including a backlight unit capable of saving material costs of a wavelength filter layer and / or increasing light diffusion to reduce an optical distance.

[0008] The technical problems of the present disclosure are not limited to the above-mentioned problems. Those skilled in the art can clearly understand other technical problems not mentioned through the following description.

[0009] Technical Solution

[0010] A backlight unit according to an embodiment for solving the above-mentioned technical problem includes: a first substrate; a plurality of light sources arranged on one surface of the first substrate; a first reflective film arranged on one surface of the first substrate and including a first opening portion exposing the respective light sources; and a plurality of wavelength filter layers arranged on the first reflective film, the plurality of wavelength filter layers being arranged spaced apart from each other corresponding to the first opening portion, and each of the wavelength filter layers covering at least one of the first opening portions.

[0011] The wavelength filter layer may have different transmittances according to the wavelength of the incident light and the incident angle based on the normal direction.

[0012] It may be that the light source emits light in a first wavelength band, the wavelength filter layer has a first transmittance with respect to light in a first incident angle range, and has a second transmittance greater than the first transmittance with respect to light in a second incident angle range greater than the first incident angle range.

[0013] Alternatively, the backlight unit further includes a wavelength conversion film disposed above the wavelength filter layer, and configured to convert light in the first wavelength band into light in a second wavelength band different from the first wavelength band.

[0014] The wavelength filter layer may have a width greater than a width of the first opening portion covered by the layer.

[0015] The wavelength filter layer may completely cover the first opening and overlap with the first reflective film around the first opening.

[0016] It may be that the distance between adjacent wavelength filter layers is greater than the width of the wavelength filter layer.

[0017] Alternatively, the backlight unit further includes a second reflective film disposed on the wavelength filter layer and including a second opening portion overlapping the first opening portion.

[0018] Alternatively, the backlight unit further includes a diffusion plate disposed above the wavelength filtering layer.

[0019] The backlight unit may further include a plurality of reflection patterns disposed on a bottom surface of the diffusion plate, and a pitch of the reflection patterns at a first distance from the light source is smaller than a pitch of the reflection patterns at a second distance from the light source greater than the first distance.

[0020] Effects of the Invention

[0021] According to an embodiment of the backlight unit, regardless of the reduction in optical distance, by configuring the wavelength filter layer between the light source and the diffusion plate, the light emitted toward the upper direction of the light source is reduced, and the light diffusion is increased, so that the brightness uniformity can be improved. In addition, the wavelength filter layer is selectively patterned and configured only in the area where the wavelength filter layer is needed, which can save material costs.

[0022] According to the backlight unit of various embodiments, by configuring the reflective film into a plurality of layers, it is possible to prevent light emitted from a light source from being visible to the outside.

[0023] The effects according to the embodiments are not limited to the above-exemplified contents, and more various effects are included in this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an exploded perspective view of a display device according to an embodiment.

[0025] Figure 2 is along Figure 1 Cross-sectional view of the II-II' line cutting.

[0026] Figure 3 It is a configuration diagram showing the relative positional relationship of the light source, the reflecting member, and the wavelength filter layer of the light source unit.

[0027] Figure 4 is shown corresponding to Figure 3 An exploded perspective view of a portion of a backlight unit of a light source.

[0028] Figure 5 is along Figure 3 Cross-sectional view of the V-V' line cutting.

[0029] Figure 6 Is magnification Figure 5 The cross-sectional view corresponds to an enlarged view of the light source component, the reflective component and the wavelength filtering layer of a light source.

[0030] Figure 7 is a cross-sectional view of a wavelength filtering layer according to an embodiment.

[0031] Figure 8 : is a graph showing the transmittance according to the angle at which light having a wavelength band of about 450 nm is incident on the wavelength filter layer.

[0032] Fig. 9 is a graph showing brightness according to the ground angle of a light source.

[0033] Fig.10 FIG. 4 is a schematic diagram showing the traveling direction of light emitted from a light source according to an embodiment.

[0034] Fig.11 is a cross-sectional view of a wavelength filtering layer according to another embodiment.

[0035] Fig.12 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to another embodiment.

[0036] Fig.13 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment.

[0037] Fig.14 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment.

[0038] Fig.15is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment.

[0039] Fig.16 is an exploded perspective view illustrating a portion of a backlight unit corresponding to one light source according to still another embodiment.

[0040] Fig.17 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment.

[0041] Fig.18 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment.

[0042] Fig.19 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment.

[0043] Fig. 20 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment.

[0044] Fig.21 1 is a configuration diagram showing the relative positional relationship among a light source, a reflective member, and a wavelength filter layer of a light source member according to still another embodiment.

[0045] Fig. 22 is along Fig.21 Cross-sectional view of the XXII-XXII' line cutting.

[0046] Fig.23 1 is a configuration diagram showing the relative positional relationship among a light source, a reflective member, and a wavelength filter layer of a light source member according to still another embodiment.

[0047] Fig.24 is an exploded perspective view illustrating a portion of a backlight unit corresponding to one light source according to still another embodiment.

[0048] Fig.25 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment.

[0049] Fig.26 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment.

[0050] Fig. 27 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment.

[0051] Fig.28 It is a cross-sectional view of a light source component, a reflective component, a wavelength filter layer, and a diffusion plate according to another embodiment.

[0052] Description of Reference Numerals

[0053] 10: backlight unit; 70: display panel; 80: housing; 100: light source component; 110: first substrate; 120: light source. DETAILED DESCRIPTION

[0054] The benefits and features of the present disclosure and methods for achieving them are readily apparent from and may be found in the accompanying drawings. Figure 1 The embodiments described in detail below will be clear. However, the present disclosure is not limited to the embodiments disclosed below, and can also be implemented in different forms. That is, the present disclosure is defined only according to the scope of the claims.

[0055] When an element or layer is described as being "on" or "over" another element or layer, it includes not only the case where it is directly on the other element or layer, but also all cases where there are other layers or other elements in between. On the contrary, when an element is described as being "directly on" or "directly over", it means that there are no other elements or layers in between.

[0056] Throughout the specification, the same reference numerals are used to refer to the same or like parts.

[0057] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0058] Figure 1 is an exploded perspective view of a display device according to an embodiment. Figure 2 is along Figure 1 Cross-sectional view of the II-II' line cutting.

[0059] refer to Figure 1 and Figure 2 The display device 1, as a device for displaying images or videos, may include: televisions, outdoor advertising boards, monitors, personal computers, laptop computers, tablet computers, smart phones, car navigation units, cameras, central information displays (CIDs) provided to cars, watch-type electronic devices, PDAs (Personal Digital Assistants), portable multimedia players (PMPs), game consoles, and other electronic devices. They are only proposed as embodiments and can be used in other electronic devices unless they exceed the concept of the present disclosure.

[0060] The first direction X, the second direction Y and the third direction Z are defined in the drawings. The first direction X and the second direction Y may be directions perpendicular to each other in a plane. The third direction Z may be a direction perpendicular to the plane in which the first direction X and the second direction Y are located. The third direction Z is perpendicular to the first direction X and the second direction Y, respectively. In the embodiment, the third direction Z represents the thickness direction of the display device 1.

[0061] Unless otherwise mentioned in the embodiments, the upper side or the upper side as one side in the third direction Z indicates the thickness direction of the display device 1 (the upper side in the drawings), and similarly, the top surface indicates the surface facing one side in the third direction Z. In addition, the lower side or the lower side as the other side in the third direction Z indicates the opposite direction of the thickness direction of the display device 1 (the lower side in the drawings), and the bottom surface refers to the surface facing the other side in the third direction Z.

[0062] The display device 1 may be formed in a rectangular shape, wherein the rectangular shape includes a long side and a short side in a plane that are longer in a first direction X than in a second direction Y. In a plane, the corner where the long side and the short side of the display device 1 intersect may be a right angle, but is not limited thereto, and may also have a rounded curve shape. The planar shape of the display device 1 is not limited to the examples, and may be a square, a circle, an ellipse, or other shapes. The display surface of the display device 1 may be arranged on one side of a third direction Z that is a thickness direction.

[0063] The display device 1 may include: a display panel 70 ; a backlight unit 10 disposed below the display panel 70 to provide light to the display panel 70 ; and a housing 80 to house the display panel 70 and the backlight unit 10 .

[0064] The display panel 70 can receive light emitted by the backlight unit 10 to display a picture. The display panel 70 can be a light-receiving display panel, for example, a liquid crystal display panel, an electrowetting display panel, an electrophoretic display panel, etc. The following example is taken as an example to explain the case where the display panel 70 is a liquid crystal display panel (LCD). However, it is self-evident that the following description is also applicable when the display panel 70 is of other types.

[0065] The display panel 70 may include: an upper substrate 710; a lower substrate 720, which is opposite to the upper substrate 710; and a liquid crystal layer 730, which is arranged between the upper substrate 710 and the lower substrate 720. The display panel 70 may also include a plurality of pixels. The pixels of the display panel 70 may be arranged in rows and columns. The display panel 70 may include: a switching element and a pixel electrode on each pixel, and a common electrode opposite to the pixel electrode. The switching element and the pixel electrode are arranged on the lower substrate 720, and the common electrode may be arranged on the upper substrate 710. However, it is not limited thereto, and the common electrode may also be arranged on the lower substrate 720. A sealing component 92 is arranged on the frame of the upper substrate 710 and the lower substrate 720, so that the liquid crystal molecules of the liquid crystal layer 730 can be locked.

[0066] The backlight unit 10 is disposed below the display panel 70 . The backlight unit 10 may include a light source component 100 , a reflective component 200 , a wavelength filter layer 300 , a diffusion plate 400 , a wavelength conversion film 500 , and an optical sheet 600 .

[0067] The light source component 100 may include: a first substrate 110 ; and a plurality of light sources 120 disposed on the first substrate 110 .

[0068] The light source 120 emits light provided to the display panel 70. The light source 120 may be a point light source. The light source 120 may be provided in the form of a chip. In the illustrated embodiment, the light source 120 may be a light emitting diode chip (LED chip), but is not limited thereto. The light emission direction of each light source 120 may be generally directed upward in the drawings.

[0069] The light source 120 may emit light of a specific wavelength band. For example, the light source 120 may emit blue light having a wavelength band of 420 nm or even 470 nm. In some embodiments, the light source 120 may emit light having more than two peak wavelengths. For example, the light source 120 may emit light of near ultraviolet wavelengths and blue light.

[0070] The light emitted by the light source 120 may be incident on the wavelength filter layer 300 above.

[0071] The reflective component 200 may be disposed on the first substrate 110 so as to surround at least one light source 120. The reflective component 200 reflects at least a portion of light so that it can enter the wavelength filter layer 300 again, and the at least a portion of light is at least a portion of light emitted from the light source 120 that enters the wavelength filter layer 300 side but fails to pass through and is reflected.

[0072] The wavelength filter layer 300 may be overlapped and disposed above the light source component 100. The wavelength filter layer 300 plays the role of transmitting a portion of the light emitted from the light source 120 and incident on the wavelength filter layer 300 and reflecting another portion. The reflectivity of the light passing through the wavelength filter layer 300 varies depending on the wavelength or incident angle of the light.

[0073] The light source component 100 , the reflective component 200 and the wavelength filter layer 300 will be described in detail later.

[0074] A diffusion plate 400 may be disposed above the wavelength filter layer 300. The diffusion plate 400 may be disposed apart from the wavelength filter layer 300 along the third direction Z. The diffusion plate 400 may be disposed at a predetermined distance from the wavelength filter layer 300, thereby dispersing the light emitted from the light source 120 and preventing light from being concentrated. The diffusion plate 400 diffuses the light emitted from the wavelength filter layer 300 to the display panel 70 side, so that the light emitted from the light source 120 is provided to the display panel 70 with more uniform brightness. However, the invention is not limited thereto, and the diffusion plate 400 may be disposed on the wavelength filter layer 300.

[0075] The diffusion plate 400 may include a light-transmitting material, such as polymethyl methacrylate (PMMA), polystyrene (PS), polypropylene (PP), polyethylene terephthalate (PET), polycarbonate (PC), and the like.

[0076] A wavelength conversion film 500 may be disposed above the diffusion plate 400. The wavelength conversion film 500 plays a role in converting the wavelength of at least a portion of light emitted from the diffusion plate 400 to the display panel 70 side.

[0077] The wavelength conversion film 500 may include an adhesive layer and wavelength conversion particles dispersed in the adhesive layer. In addition, the wavelength conversion film 500 may further include scattering particles dispersed in the adhesive layer in addition to the wavelength conversion particles.

[0078] The adhesive layer, as a medium for dispersing wavelength conversion particles, can be composed of a variety of resin compositions. However, this is not limited to this, and any medium that can disperse wavelength conversion particles and / or scattering particles can be referred to as an adhesive layer regardless of its name, additional functions, constituent materials, etc.

[0079] The wavelength conversion particles are particles that convert the wavelength of incident light, and may be, for example, quantum dots (QD), fluorescent materials, or phosphorescent materials. The following description will take the wavelength conversion particles 222 as quantum dots as an example, but the invention is not limited thereto.

[0080] Quantum dots are materials with a crystalline structure of several nanometers in size, composed of hundreds to thousands of atoms. Due to their small size, they can show the quantum confinement effect that increases the energy band gap. When light with a wavelength higher than the band gap energy is incident on a quantum dot (QD), the quantum dot (QD) absorbs the light and becomes excited, and then drops to the ground state while emitting light of a specific wavelength. The wavelength of light emitted has a value equivalent to the band gap. By adjusting the size and composition of these quantum dots (QD), the luminescence characteristics brought about by the quantum confinement effect can be adjusted.

[0081] The quantum dots may include, for example, at least one of a II-VI compound, a II-V compound, a III-VI compound, a III-V compound, a IV-VI compound, a I-III-VI compound, a II-IV-VI compound, and a II-IV-V compound.

[0082] The quantum dot may include a core and a shell that fully coats the core. The core is not limited thereto, but may be, for example, CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InP, InAs, InSb, SiC, Ca, Se, In, P, Fe, Pt, Ni, Co, Al, Ag, Au, Cu, FePt, Fe 2 O 3 , Fe 3 O 4 The shell is not limited thereto, but may be, for example, at least one of ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgSe, HgTe, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, GaSe, InN, InP, InAs, InSb, TlN, TlP, TlAs, TlSb, PbS, PbSe, and PbTe.

[0083] The wavelength conversion particles may include a plurality of wavelength conversion particles that convert incident light into wavelengths different from each other. For example, the wavelength conversion particles may include: a first wavelength conversion particle that converts incident light of a specific wavelength into a first wavelength for emission; and a second wavelength conversion particle that converts incident light of a specific wavelength into a second wavelength for emission. In the illustrated embodiment, the light emitted from the light source 120 and incident on the wavelength conversion particles is blue wavelength light, the first wavelength is a green wavelength, and the second wavelength may be a red wavelength. The blue wavelength may be a wavelength having a peak at 420nm or even 470nm, the green wavelength may be a wavelength having a peak at 520nm or even 570nm, and the red wavelength may be a wavelength having a peak at 620nm or even 670nm. However, the blue, green, and red wavelengths are not limited to the above examples, and should be understood to include all wavelength ranges that are considered to be blue, green, and red in the technical field.

[0084] At least one optical sheet 600 may be disposed above the wavelength conversion film 500. The optical sheet 600 may perform optical functions such as light collection, refraction, diffusion, reflection, polarization, and phase delay on incident light. Examples of the optical sheet 600 include prism sheets, microlenses, lens sheets, diffusers, polarizers, reflective polarizers, phase difference sheets, and protective sheets. In various embodiments, the optical sheet 600 may be formed by combining multiple layers having optical functions into one.

[0085] The housing 80 accommodates the backlight unit 10 and the display panel 70. The housing 80 may include a bottom plate or a bracket. Although not shown in the drawings, the housing 80 may also include a top plate.

[0086] The housing 80 may include a bottom surface 81 and a side wall 82. The side wall 82 of the housing 80 is connected to the bottom surface 81 and may be bent from the bottom surface 81 in a vertical direction. The light source component 100 of the backlight unit 10 is disposed on the bottom surface 81 of the housing 80. The reflective component 200, the wavelength filter layer 300, the diffusion plate 400, the wavelength conversion film 500, the optical sheet 600 and the display panel 70 of the backlight unit 10 may be fixed to the side wall 82 of the housing 80 by an adhesive tape 91. However, it is not limited thereto, and the components may be placed on other mounting structures of the housing 80, or may be placed or attached to a mold frame provided inside the housing 80.

[0087] Hereinafter, the light source component 100 , the reflection component 200 and the wavelength filter layer 300 will be described in detail.

[0088] Figure 3 It is a configuration diagram showing the relative positional relationship of the light source, the reflecting member, and the wavelength filter layer of the light source unit. Figure 4 is shown corresponding to Figure 3 An exploded perspective view of a portion of a backlight unit of a light source.

[0089] refer to Figure 3 , multiple light sources 120 can be arranged in a matrix shape. The multiple light sources 120 can be configured at predetermined intervals from each other along the first direction X and the second direction Y on the plane. Among them, the multiple light sources 120 are separated from each other means that they are separated from each other based on the light emitting portion of each light source 120. Therefore, not only the case where the light source packages constituting each light source 120 are separated from each other, but also the case where the light source packages of each light source 120 are adjacent or connected, as long as the light emitting portions of the multiple light sources 120 are separated, it can also be interpreted as the multiple light sources 120 being separated. Although the accompanying drawings show that the arrangement direction of the light sources 120 is consistent with the extension direction of the long sides and short sides of the display device 1, it is not limited to this. The arrangement direction of the light sources 120 and the extension direction of the long sides / short sides of the display device 1 can be inclined at a predetermined inclination. In addition, Figure 3 In the illustrated embodiment, the rows and columns of the light sources 120 are shown to extend in a straight line, but the light sources 120 may be arranged in a manner such that adjacent rows and / or adjacent columns are staggered with each other.

[0090] Unless in Figure 3 As described separately in , the first direction X spacing Rax of each light source 120 is defined as the shortest distance between the two sides of two light sources 120 adjacent along the first direction X and opposite to each other along the first direction X, and the second direction Y spacing Ray of each light source 120 is defined as the shortest distance between the two sides of two light sources 120 adjacent along the second direction Y and opposite to each other along the second direction Y.

[0091] Each light source 120 may be configured as a square having the same side length RLx in the first direction X and the same side length RLy in the second direction Y. In the following embodiments, the plane shape of each light source 120 is described using a square shape, but the plane shape of each light source 120 is not limited thereto, and other shapes such as a rectangle and a circle may be used.

[0092] The first X-direction spacing Rax and the second Y-direction spacing Ray of the light sources 120 can be as follows: Figure 3 However, the present invention is not limited thereto, and the interval Rax between two adjacent light sources 120 along the first direction X and the interval Ray between two adjacent light sources 120 along the second direction Y may be different from each other.

[0093] The spacing Rax of the light sources 120 in the first direction X and the spacing Ray of the light sources 120 in the second direction Y may be greater than or equal to the side length RLx of the first direction X on the plane constituting the light sources 120 and the side length RLy of the second direction Y on the plane constituting the light sources 120. If the size (RLx, RLy) of the light source 120 is smaller than the spacing Rax, Ray between two adjacent light sources 120 on the plane, bright and dark parts may be generated, but the brightness uniformity can be improved by the relative configuration of the reflective component 200, the wavelength filter layer 300 and the diffusion plate 400 described later.

[0094] The reflective member 200 may include a reflective film 210 and a reflective coating layer 220 (see Figure 5 The reflective member 200 may be disposed on a surface of the first substrate 110 where the light source 120 is not disposed.

[0095] The reflective film 210 may have a planar shape substantially similar to that of the display panel 70. For example, if the display panel 70 has a rectangular planar shape, the reflective film 210 may also have a similar rectangular planar shape. The size of the reflective film 210 in a plan view may be substantially the same as that of the display panel 70, but is not limited thereto.

[0096] The reflective film 210 may include at least one opening 210h. The opening 210h is formed to completely penetrate the reflective film 210 along the third direction Z (or thickness direction). The opening 210h may have a predetermined radius W. 2 and the predetermined height h 2 cylindrical.

[0097] The height h of the opening 210h 2 The height may be the same as the height of the reflective film 210 .

[0098] The plurality of openings 210h may be circular with the same area, but the present invention is not limited thereto, and the planar shape of the openings 210h may be other shapes such as square, ellipse, rectangle, or the planar shapes of the openings 210h may be different in size.

[0099] Each opening 210h may be formed at a predetermined distance. A plurality of openings 210h may be formed at predetermined intervals along the first direction X and the second direction Y. The reflective film 210 may be configured in such a manner that each opening 210h exposes at least one light source 120 along the third direction Z (or thickness direction). In one embodiment, each opening 210h may be formed in a one-to-one correspondence with one light source 120.

[0100] Each opening 210h formed in the reflective film 210 may be configured to surround at least one light source 120. The opening 210h may completely expose the light source 120 along the third direction Z. In one embodiment, the area of ​​the opening 210h is larger than the area of ​​the corresponding light source 120, and the light source 120 may be completely exposed toward the display surface.

[0101] The spacing Rbx between two openings 210h adjacent to each other along the first direction X and the spacing Rby between two openings 210h adjacent to each other along the second direction Y may be the same as each other. However, this is not limited thereto, and the spacing Rbx between two openings 210h adjacent to each other along the first direction X and the spacing Rby between two openings 210h adjacent to each other along the second direction Y may be different from each other depending on the shape of the individual openings 210h.

[0102] In the illustrated embodiment, the first direction X spacing Rax and the second direction Y spacing Ray of the two light sources 120 may be respectively greater than the first direction X spacing Rbx and the second direction Y spacing Rby of the two openings 210h. The larger the diameter of the opening 210h, the greater the difference between the spacing Rax and Ray between the light sources 120 and the spacing Rbx and Rby between the openings 210h.

[0103] The wavelength filter layer 300 may be disposed on one side of the reflective film 210. In one embodiment, the wavelength filter layer 300 may have been patterned. Each wavelength filter layer 300 may be separated from each other. The shape of each patterned wavelength filter layer 300 may be cylindrical. Each wavelength filter layer 300 may have a planar shape similar to the opening 210h. For example, in the case where the planar shape of the opening 210h is circular, the wavelength filter layer 300 may also have a circular shape similar in plan. However, this is not limited to this, and the planar shapes of the opening 210h and the wavelength filter layer 300 may also be different.

[0104] The wavelength filter layer 300 may be configured to overlap with at least one light source 120 and / or the opening 210h along the third direction Z. The wavelength filter layer 300 may completely cover at least one light source 120 and / or the opening 210h. Each wavelength filter layer 300 may be overlapped and configured in a one-to-one correspondence with one light source 120 and / or one opening 210h.

[0105] When the planar shape of the opening 210h and the wavelength filter layer 300 is circular, the width 2W of the wavelength filter layer 300 is 3 It may be larger than the width 2W of the planar shape of the opening 210h. 2That is, the area of ​​the wavelength filter layer 300 is larger than the area of ​​the corresponding light source 120 and / or the area of ​​the opening 210h, so that the light source 120 and / or the opening 210h can be completely covered along the display surface direction. Therefore, a part of the wavelength filter layer 300 (such as the frame area) can be configured to overlap with the top surface of the reflective film 210.

[0106] The plurality of wavelength filter layers 300 may be spaced apart at a predetermined interval. The plurality of wavelength filter layers 300 may be configured to be spaced apart at a predetermined interval along the first direction X and the second direction Y. The interval Rcx between two wavelength filter layers 300 adjacent along the first direction X and the interval Rcy between two wavelength filter layers 300 adjacent along the second direction Y may be the same as each other. However, this is not limited thereto, and the interval Rcx between two wavelength filter layers 300 adjacent along the first direction X and the interval Rcy between two wavelength filter layers 300 adjacent along the second direction Y may be different from each other depending on the shape of the individual wavelength filter layers 300.

[0107] An adhesive layer AM may be disposed between the reflective film 210 and the wavelength filter layer 300. The adhesive layer AM plays a role in fixing the wavelength filter layer 300 on the reflective film 210. The adhesive layer AM may be disposed in the region where the reflective film 210 and the wavelength filter layer 300 overlap on the reflective film 210. That is, the adhesive layer AM may be disposed in the region that overlaps with the individual wavelength filter layer 300 on one surface of the reflective film 210 on a plane, excluding the region of the individual opening portion 210h. For example, the adhesive layer AM may be disposed in the peripheral portion of the individual wavelength filter layer 300 on a plane.

[0108] Figure 5 is along Figure 3 For the convenience of explanation, Figure 5 The diffusion plate 400 disposed above the wavelength filter layer 300 is also shown. Figure 6 is from Figure 5 An enlarged view of a light source component, a reflective component and a wavelength filtering layer corresponding to a light source in a cross-sectional view.

[0109] Reference 5 and Figure 6 The light source component 100 may include: a first substrate 110 ; and a plurality of light sources 120 arranged on the first substrate 110 .

[0110] The first substrate 110 may be an insulating substrate or a circuit substrate. When the first substrate 110 is an insulating substrate, the first substrate 110 may be composed of a transparent material such as glass or quartz, or may be composed of a polymer material such as polyimide. When the first substrate 110 is an insulating substrate, the light source component 100 may further include a circuit element layer (not shown) for driving the light source 120. The circuit element layer may be formed on one side of the insulating substrate, or may be formed as a printed circuit substrate and attached or fixed to one side of the insulating substrate. When the first substrate 110 is a circuit substrate, the first substrate 110 may be composed of a printed circuit substrate (PCB). When the first substrate 110 is a printed circuit substrate, the multiple light sources 120 mounted on the first substrate 110 may be electrically connected to each other.

[0111] The first substrate 110 may have a planar shape substantially similar to that of the display panel 70. For example, if the display panel 70 has a rectangular planar shape, the first substrate 110 may also have a similar rectangular planar shape. The size of the first substrate 110 in a plan view may be substantially the same as that of the display panel 70, but is not limited thereto.

[0112] Each light source 120 may be in the shape of a rectangular parallelepiped. The side length RLx constituting the first direction X and the side length RLy constituting the second direction Y on the plane of the light source 120 may be about 250 μm or about 500 μm, respectively. The height of each light source 120 may be smaller than the side lengths RLx and RLy on the plane of the light source 120, for example, may be about 130 μm or about 200 μm. In the illustrated embodiment, the planar shape of each light source 120 is a square whose side lengths RLx constituting the first direction X and the side lengths RLy constituting the second direction Y are both about 500 μm and the same, and the height h of the light source 120 is about 130 μm or about 200 μm. 1 (ie, a distance along the third direction Z from the top surface of the first substrate 110 to the top surface of the light source 120 ) may be about 150 μm.

[0113] As described above, the interval Ray of the second direction Y of each light source 120 may be greater than the side length RLy of each light source 120 constituting the second direction Y. In the illustrated embodiment, when the side length RLy of each light source 120 constituting the second direction Y is about 500 μm, the interval Ray of the second direction Y of each light source 120 may be 50 mm. However, it is not limited thereto, and when the side length RLy of each light source 120 constituting the second direction Y is about 500 μm, the interval Ray of the second direction Y of each light source 120 may be less than or equal to about 50 mm.

[0114] The reflective film 210 serves to reflect at least a portion of the light that leaks out from the light source 120 to the side and / or the light that enters the wavelength filter layer 300 but fails to pass through and is instead reflected, so that it re-enters the wavelength filter layer 300.

[0115] The reflective film 210 may include a reflective material. The reflective film 210 may be formed of a material including, for example, silver (Ag), copper (Cu), aluminum (Al), nickel (Ni), lanthanum (La) or alloys thereof, indium tin oxide (ITO, Indium Tin Oxide), indium zinc oxide (IZO, Indium Zinc Oxide), indium tin zinc oxide (ITZO, Indium Tin-Zinc Oxide), etc., but is not limited thereto.

[0116] The reflective film 210 may be arranged in a plan view so as to surround the light source 120. In one embodiment, an opening 210h is present at a position where the plurality of light sources 120 arranged in a matrix shape are arranged, so that the reflective film 210 may be spaced apart from the light source 120 in a horizontal direction on the first substrate 110. The reflective film 210 may not overlap with the light source 120 in a thickness direction on the first substrate 110.

[0117] The reflective film 210 includes a top surface and a bottom surface. The top surface and the bottom surface of the reflective film 210 face each other. The top surface and the bottom surface of the reflective film 210 are each located on a plane, and the plane where the top surface is located and the plane where the bottom surface is located are substantially parallel, so that the overall thickness is uniform. The bottom surface of the reflective film 210 is placed on one surface of the first substrate 110.

[0118] The reflective film 210 may include side walls exposed by each opening 210h. The side walls of the reflective film 210 may face the light source 120. In one embodiment, the plane where the side walls of the reflective film 210 are located and the plane where the top surface and / or bottom surface of the reflective film 210 are located may form an angle of about 90°. The side walls of the reflective film 210 and the plane where the top surface of the first substrate 110 are located may also form an angle of about 90°.

[0119] The thickness h of the reflective film 210 is 2 (ie, the distance from one surface of the first substrate 110 to the top surface of the reflective film 210 along the third direction Z) may be greater than or equal to the height h of the light source 120. 1 The thickness h of the reflective film 210 is 2 Greater than the height h of the light source 120 1 In the case of the light source 120, the light emitted by the light source 120 can be effectively prevented from leaking into the space between the wavelength filter layers 300. In the illustrated embodiment, the height h of the light source 120 is 1 is 150 μm, and the thickness h of the reflective film 210 is2 It may be 200 μm or even 300 μm, but is not limited thereto.

[0120] The reflective coating layer 220 is disposed on one side of the first substrate 110. In one embodiment, the reflective coating layer 220 may be disposed on one side of the first substrate 110 in a space separated by the light source 120 and the reflective film 210. The reflective coating layer 220 may be disposed in a manner of surrounding the light source 120 in a plan view. The reflective coating layer 220 may at least partially or entirely cover the side of the first substrate 110 where the light source 120 and the reflective film 210 are exposed.

[0121] The reflective coating layer 220 serves to reflect at least a portion of the light emitted from the light source 120 that enters the wavelength filter layer 300 side but fails to pass through and is reflected and travels to one side of the first substrate 110, to the reflective film 210 and / or the wavelength filter layer 300 side, so as to minimize light leakage and diversify the incident angle of the light incident on the wavelength filter layer 300 side.

[0122] The reflective coating layer 220 may include a reflective substance. The reflective coating layer 220 may be formed of the above-mentioned substances that can be used for the reflective film 210. For example, the reflective coating layer 220 may be formed of a material including metals such as silver (Ag), copper (Cu), aluminum (Al), nickel (Ni), lanthanum (La) or their alloys, indium tin oxide (ITO, Indium Tin Oxide), indium zinc oxide (IZO, Indium Zinc Oxide), indium tin zinc oxide (ITZO, Indium Tin-Zinc Oxide), etc., but is not limited thereto. The reflective coating layer 220 may be formed of other substances different from the reflective film 210.

[0123] The reflective coating layer 220 may include a top surface, a bottom surface, and side surfaces. The bottom surface of the reflective coating layer 220 is disposed on one surface of the first substrate 110. The top surface of the reflective coating layer 220 faces the bottom surface of the wavelength filter layer 300. The top surface and the bottom surface of the reflective coating layer 220 are respectively located on a plane, and the plane where the top surface is located is substantially parallel to the plane where the bottom surface is located, and the overall thickness may be uniform. 3 (ie, the distance from the bottom surface of the reflective coating layer 220 to the top surface of the reflective coating layer 220 along the third direction Z). The thickness h of the reflective coating layer 220 is 3 can be smaller than the thickness h of the reflective film 210 2 , may be less than or equal to the height h of the light source 120 1 .

[0124] The side surface of the reflective coating layer 220 may be adjacent to the side surface of the light source 120 and / or the side wall of the opening 210h of the reflective film 210. In one embodiment, the plane where the side surface of the reflective coating layer 220 is located and the plane where the top surface and / or the bottom surface of the reflective coating layer 220 are located may form an angle of about 90°. However, this is not limited to this. The closer the top surface of the reflective coating layer 220 is to the side surface of the light source 120 and / or the reflective film 210, the higher the height from the bottom surface (i.e., the distance from the bottom surface of the reflective coating layer 220 to the top surface of the reflective coating layer 220 along the third direction Z) will become. Therefore, the plane where the side surface of the reflective coating layer 220 is located and the plane where the top surface of the reflective coating layer 220 is located may not form an angle of about 90°.

[0125] The wavelength filter layer 300 may include a top surface 300a, a bottom surface 300b, and a side surface 300s. The bottom surface 300b of the wavelength filter layer 300 is opposite to the top surface of the light source 120. The top surface 300a and the bottom surface 300b of the wavelength filter layer 300 are respectively located on a plane, and the plane where the top surface 300a is located is substantially parallel to the plane where the bottom surface 300b is located, so that the overall thickness can be uniform. The width 2W of the top surface 300a of the wavelength filter layer 300 is 3 and the width 2W of the bottom surface 300b 3 Therefore, the plane where the side surface 300s of the wavelength filter layer 300 is located and the plane where the top surface 300a and / or the bottom surface 300b of the wavelength filter layer 300 are located can form a 90° angle. That is, the multiple refractive layers (refer to Figure 7 ) can be aligned on their sides.

[0126] The width of the wavelength filter layer 300 is 2W 3 The width 2W of the opening 210h corresponding to the wavelength filter layer 300 and exposing the light source 120 along the third direction Z may be greater than that of the opening 210h. 2 Therefore, the side surface 300s of the wavelength filter layer 300 at least partially overlaps with the reflective film 210 along the third direction Z, and a portion of the top surface 300a and / or bottom surface 300b of the wavelength filter layer 300 may overlap with the reflective film 210 along the third direction Z.

[0127] The width of the wavelength filter layer 300 is 2W 3 Greater than the width 2W of the opening 210h 2 , completely covering the space of the opening 210h, thereby reducing the light leakage to the space between the reflective film 210 and the wavelength filter layer 300. The detailed description of the path of the light emitted from the light source 120 to the wavelength filter layer 300 will be referred to later. Fig.10 Narrative.

[0128] The adhesive layer AM is disposed between the reflective film 210 and the wavelength filtering layer 300. The adhesive layer AM may include a top surface AMa, a bottom surface AMB, and side surfaces AMsi and AMso. The bottom surface AMB of the adhesive layer AM is placed on the reflective film 210. The top surface AMa of the adhesive layer AM may be opposite to the bottom surface AMB of the adhesive layer AM. The top surface AMa and the bottom surface AMB of the adhesive layer AM are respectively located on a plane, and the plane where the top surface AMa of the adhesive layer AM is located is approximately parallel to the plane where the bottom surface AMB of the adhesive layer AM is located, so that it can have a uniform thickness overall. In the illustrated embodiment, the thickness of the adhesive layer AM may be about 50 μm. The plane where the side surfaces AMsi and AMso of the adhesive layer AM are located may form an angle of about 90° with the plane where the top surface AMa and / or the bottom surface AMB of the adhesive layer AM are located.

[0129] The adhesive layer AM is directly formed on the top surface of the reflective film 210, so that the bottom surface AMB of the adhesive layer AM can be in contact with the top surface of the reflective film 210. The bottom surface AMB of the adhesive layer AM can be configured and in contact with a portion of the top surface of the reflective film 210. That is, the adhesive layer AM can overlap with a portion of the reflective film 210 along the third direction Z. The bottom surface AMB of the adhesive layer AM can be configured in an area close to the opening 210h on the top surface of the reflective film 210. The top surface AMa of the adhesive layer AM can be in contact with the bottom surface of the wavelength filter layer 300. The top surface AMa of the adhesive layer AM is configured at the peripheral portion of the wavelength filter layer 300, so that it can overlap with a portion of the wavelength filter layer 300 along the third direction Z. The adhesive layer AM can be configured in a circular ring shape in a plan view.

[0130] The adhesive layer AM may be configured to completely cover the region where the reflective film 210 and the wavelength filter layer 300 overlap along the third direction Z. The width (W 3 -W 2 ) can be related to the radius W of the wavelength filter layer 300 3 and the radius W of the opening 210h 2 The difference is the same.

[0131] The adhesive layer AM may include two side surfaces AMsi and AMso in the cross-sectional view. The side surfaces AMsi and AMso of the adhesive layer AM may include: an inner side surface AMsi, which is arranged in the inner direction of the corresponding opening 210h; and an outer side surface AMso, which is arranged in the outer direction of the opening 210h. The plane included in the inner side surface AMsi of the adhesive layer AM may be aligned with the side wall of the reflective film 210 formed by the opening 210h along the third direction Z. The plane included in the outer side surface AMso of the adhesive layer AM may be aligned with the side surface of the wavelength filter layer 300 along the third direction Z.

[0132] The diffusion plate 400 is disposed above the wavelength filter layer 300. The diffusion plate 400 may have a planar shape that is substantially similar to the display panel 70. For example, when the display panel 70 has a planar shape of a rectangular shape, the diffusion plate 400 also has a planar shape of a similar rectangular shape. The size of the diffusion plate 400 and the size of the display panel 70 in a plan view may be substantially the same, but are not limited thereto.

[0133] The diffusion plate 400 may be configured on the wavelength filter layer 300 and separated from the wavelength filter layer 300. The distance from the top surface of the first substrate 110 to the bottom surface of the diffusion plate 400 along the third direction Z is defined as an optical distance OD (Optical Distance). In the illustrated embodiment, the optical distance OD (Optical Distance) may be less than or equal to the second direction Y spacing Ray of the light source 120. Therefore, the optical distance OD (Optical Distance) may be less than or equal to about 50 mm. However, it is not limited thereto, and the optical distance OD (Optical Distance) may also be greater than 50 mm.

[0134] In order to minimize the loss of light emitted from the light source 120 and maximize the improvement of brightness uniformity when the optical distance OD (Optical Distance) is shortened, it is preferred to set a suitable configuration relationship between the light source 120, the reflective film 210 and the wavelength filter layer 300. Figure 6 Specifically, the relative positional relationship of the light source 120 , the reflective film 210 , the opening 210 h , and the wavelength filter layer 300 corresponding to the individual light sources 120 is described to minimize light loss and optimize brightness uniformity.

[0135] The light source 120 may be disposed at the center of one side of the first substrate 110 exposed by the opening 210h. Since the side length RLy of the light source 120 in the second direction Y is smaller than the width 2W of the opening 210h, 2 The light source 120 and the reflective film 210 may be spaced apart along the second direction Y. Therefore, the light source 120 and the reflective film 210 are arranged at a predetermined interval on the first substrate 110 so that at least a portion of one surface of the first substrate 110 is exposed along the third direction Z.

[0136] In the illustrated embodiment, the light source 120 may emit light from the center of the top surface of the light source 120. The light emitted by the light source 120 travels approximately from the top surface of the light source 120 along the third direction Z side. A portion of the light emitted by the light source 120 travels along the third direction Z side at a predetermined angle with the plane where the top surface of the light source 120 is located. The light emitted from the light source 120 has a light path within the directional angle range of the light source 120. In the illustrated embodiment, the directional angle of the light source 120 may be 140°.

[0137] Specifically, a reference line L passing through the center of the light source 120 along the third direction Z 0 When defined, the path of light emitted from the light source 120 may be aligned with the reference line L 0 The first angle θ that forms an acute angle L In one embodiment, the path of the light emitted by the light source 120 is aligned with the reference line L 0 The first angle θ L It can be less than about 70°. That is, the path of the light emitted from the light source 120 is substantially the same as the reference line L. 0 The first angle θ L The maximum value can be about 70°.

[0138] The path of the light emitted from the light source 120 is consistent with the reference line L 0 The first angle θ L The path of light at maximum is defined as the reference path line L M When the light emitted from the light source 120 is approximately along the reference line L 0 and the reference path line L M From the baseline L 0 The reference path line L with the maximum angle M The wavelength filter layer 300 can pass through the wavelength filter layer 300. Therefore, the plane where the bottom surface of the wavelength filter layer 300 is located is aligned with the reference path line L M The intersection point is located inside the opening 210h and the wavelength filter layer 300, which may facilitate the light emitted from the light source 120 to enter the wavelength filter layer 300. That is, the plane where the bottom surface of the wavelength filter layer 300 is located is aligned with the reference path line L M The point of intersection with the reference line L 0 The width W between 1 Smaller than the radius W of the opening 210h 2 and the radius W of the wavelength filter layer 300 3 , thereby preventing the light emitted from the light source 120 from leaking into the separation space between the wavelength filter layer 300 and the reflective film 210, and allowing the light to be incident on the wavelength filter layer 300 side, thereby effectively minimizing the loss of light.

[0139] According to the above embodiment, even if the wavelength filter layer 300 is formed only on a part of one side of the reflection film 210, by properly arranging the light source 120, the reflection film 210 and the wavelength film pattern 220, the light emitted by the light source 120 can be effectively allowed to enter the wavelength filter layer 300. In addition, since the wavelength filter layer 300 is formed only on a part of the area, the material cost of the wavelength filter layer 300 can be saved.

[0140] Figure 7is a cross-sectional view of a wavelength filtering layer according to an embodiment.

[0141] refer to Figure 7 , the wavelength filter layer 300 may include a plurality of refractive layers. In one embodiment, the wavelength filter layer 300 may include: a first refractive layer 310 having a first refractive index; and a second refractive layer 320 having a second refractive index different from the first refractive index. The first refractive layer 310 and the second refractive layer 320 may be alternately stacked in the thickness direction. The structure of the wavelength filter layer 300 may be a structure in which the first refractive layer 310 and the second refractive layer 320 are alternately stacked in the thickness direction, and the first refractive layer 310, the second refractive layer 320, the first refractive layer 310, and the second refractive layer 320 are sequentially stacked in the thickness direction.

[0142] The top surface of the wavelength filter layer 300 may be the top surface of the second refractive layer 320, and the bottom surface of the wavelength filter layer 300 may be the bottom surface of the first refractive layer 310. The planes of the top and bottom surfaces of the plurality of refractive layers forming the wavelength filter layer 300 are parallel to each other and may have a uniform thickness as a whole.

[0143] Figure 7 In the figure, an example is given in which the wavelength filter layer 300 has a structure in which two refractive layers 310 and 320 with different refractive indices are repeatedly stacked twice, but the present invention is not limited thereto. The wavelength filter 300 can be formed by repeatedly stacking refractive layers with more than three refractive indices, or by repeatedly stacking two refractive layers with different refractive indices at least three times.

[0144] The multiple refractive layers 310 and 320 included in the wavelength filter layer 300 may include metal oxides or metal substances. For example, the metal oxide may be SiO 2 、TiO 2 、Ti 3 O 5 、 2 O 5 , Y 2 O 3 At least one of the metal substances may be MgF 2 、Na 3 AlF 6 At least one of Al, Ag, and Cr. However, it is not limited thereto.

[0145] The wavelength filter layer 300 can transmit a part of the light incident to the wavelength filter layer 300 and reflect the remaining part. The wavelength filter layer 300 repeatedly forms a refractive index difference by alternately stacking two refractive layers 310 and 320 having different refractive indices, so that the transmittance of the light incident to the wavelength filter layer 300 may be different according to its wavelength band. That is, by adjusting the constituent materials, thicknesses and / or the number of refractive layers 310 and 320 stacked, the transmittance of light in a specific wavelength band at an angle of 0° incident to the wavelength filter layer 300 can be adjusted.

[0146] For example, in order to increase the reflectivity of light in a specific wavelength band incident on the wavelength filter layer 300 at an angle of 0° to an optimal value, the thickness of each refractive layer 310, 320 can be adjusted according to the wavelength and refractive index of the light. The refractive index of the stacked refractive layers is n, and the wavelength to be reflected is λ 1 When the layers are alternately stacked (λ 1 ) / (4n) thickness of the low refractive layer and the high refractive layer, the specific wavelength λ can be effectively reflected. 1 Light with domain.

[0147] In addition, the transmittance (or reflectance) of the light incident on the wavelength filter layer 300 will be different according to its incident angle. The transmittance of the wavelength filter layer 300 according to the incident angle of the light is described below by taking the case where the light source 120 emits a blue light having a wavelength band of about 450nm and the light having a wavelength band of 450nm is incident on the wavelength filter layer 300 as an example.

[0148] Figure 8 : is a graph showing the transmittance of light having a wavelength band of about 450 nm according to the angle at which light enters the wavelength filter layer.

[0149] exist Figure 8 In the graph of FIG. 1 , the X-axis represents the second angle θ (incident angle) at which light having a wavelength band of about 450 nm is incident on the wavelength filter layer 300, and the Y-axis represents the transmittance of the light incident on the wavelength filter layer 300. The second angle θ (incident angle) at which light is incident on the wavelength filter layer 300 is as follows: Figure 7 As shown, φ is defined as an angle relative to a normal line perpendicular to the bottom surface of the wavelength filtering layer 300 .

[0150] refer to Figure 8, when the second angle θ is small, the light shows a low transmittance, but when the second angle θ exceeds 40°, the transmittance will be significantly improved. Specifically, when the second angle θ is about 0° or about 40°, the transmittance is about 5% or about 10%. That is, about 5% or about 10% of the light incident on the wavelength filter layer 300 at an angle of about 0° or about 40° will pass through the wavelength filter layer 300, but the remaining about 90% or about 95% will not pass through the wavelength filter layer 300 and will be reflected to the first substrate 110 side. On the one hand, when the second angle θ of the light emitted from the light source 120 incident on the wavelength filter layer 300 is about 55° or about 70°, the transmittance reaches about 50% or about 70%, which means that about 50% or about 70% of the light incident on the wavelength filter layer 300 will pass through the wavelength filter layer 300, and the remaining about 30% or about 50% will not pass through the wavelength filter layer 300 and will be reflected. That is, the wavelength filter layer 300 can relatively reduce the transmittance of light traveling in the normal direction (i.e., light with a small incident angle relative to the wavelength filter layer 300). The wavelength filter layer 300 having the above characteristics is applied above the light source 120 having relatively strong brightness in the normal direction, and thus the uneven brightness of light according to the angle can be improved.

[0151] Fig. 9 is a graph showing brightness according to the ground angle of a light source.

[0152] Fig. 9 , the X-axis is the ground angle from the light source 120, and the Y-axis is the brightness. Fig. 9 The luminance of the light source 120 with a pointing angle of about 140° according to the ground angle is shown. Curve A shows the luminance according to the ground angle when no wavelength filter layer 300 is arranged between the light source 120 and the diffusion plate 400, and curve B shows the luminance according to the ground angle when the wavelength filter layer 300 is arranged between the light source 120 and the diffusion plate 400.

[0153] In the case where the wavelength filter layer 300 is not disposed between the light source 120 and the diffusion plate 400, as shown in the curve A, the light emitted by the light source 120 composed of the LED chip is concentrated roughly toward the center above, and the brightness is high in the ground angle range of about -70° to about 70°, but the brightness drops sharply in the range of about -90° to about -70° and about 70° to about 90°. That is, although the central part of the light source 120 in the third direction Z is bright, its periphery is dark, and thus the uniformity of the brightness may be reduced.

[0154] When the wavelength filter layer 300 is disposed between the light source component 100 and the diffusion plate 400 , as shown in curve B, the wavelength filter layer 300 diffuses the light emitted from the light source 120 , thereby making the brightness according to the ground angle substantially uniform compared to curve A.

[0155] As in this embodiment, by disposing the wavelength filter layer 300 between the light source component 100 and the diffusion plate 400, the light emitted from the light source 120 and incident on the diffusion plate 400 is diffused once in the wavelength filter layer 300, thereby improving the brightness uniformity that decreases with the decrease of the optical distance OD (Optical Distance).

[0156] Fig.10 is a schematic diagram showing a travel path of light emitted from a light source according to an embodiment.

[0157] refer to Fig.10 , the incident angle of the light emitted from the light source 120 and incident on the wavelength filter layer 300 side can be approximately about 0° to about 70°. In the case where the incident angle of the light emitted from the light source 120 and incident on the wavelength filter layer 300 side is approximately 0° to approximately 40°, the incident light is approximately reflected at the bottom surface of the wavelength filter layer 300 and travels toward the first substrate 110 side, and at least a portion of the incident light will pass through the wavelength filter layer 300 and be emitted toward the display panel 70 side. The light reflected at the bottom surface of the wavelength filter layer 300 and traveling toward the first substrate 110 side can be reflected by the reflective coating layer 220 disposed on one surface of the first substrate 110, thereby re-entering the wavelength filter layer 300. Among them, according to the incident angle of the re-entering light, a portion of the re-entering light is either reflected again or passes through the wavelength filter layer 300. As Figure 8 As shown, when the incident angle of the light emitted from the light source 120 and incident on the wavelength filter layer 300 is about 0° or even about 40°, the ratio of the light passing through the wavelength filter layer 300 to the light reflected can be 1:9.

[0158] When the incident angle of the light emitted from the light source 120 and incident on the wavelength filter layer 300 is about 40° or even about 50°, a portion of the incident light will be reflected at the bottom surface of the wavelength filter layer 300 and travel toward the first substrate 110, and the remaining portion of the incident light will pass through the wavelength filter layer 300 and be emitted toward the display panel 70. Similarly, the light reflected at the bottom surface of the wavelength filter layer 300 and traveling toward the first substrate 110 is reflected by the reflective coating layer 220 disposed on one surface of the first substrate 110, and can re-enter the wavelength filter layer 300. Depending on the incident angle of the re-entering light, a portion of the re-entering light may be re-reflected or pass through the wavelength filter layer 300. Figure 8 As shown, when the incident angle of the light emitted from the light source 120 and incident on the wavelength filter layer 300 is about 40° or even about 50°, the ratio of the light passing through the wavelength filter layer 300 to the reflected light may be about 5:5.

[0159] When the incident angle of the light emitted from the light source 120 and incident on the wavelength filter layer 300 side is about 50° or even about 70°, the incident light substantially passes through the wavelength filter layer 300 and is emitted toward the display panel 70 side, and at least a portion of the incident light may be reflected at the bottom surface of the wavelength filter layer 300 and travel toward the first substrate 110 side. Similarly, the light reflected at the bottom surface of the wavelength filter layer 300 and traveling toward the first substrate 110 side may be reflected by the reflective coating layer 220 disposed on one surface of the first substrate 110 and re-enter the wavelength filter layer 300, and a portion of the re-entering light may be re-reflected or pass through the wavelength filter layer 300 according to the incident angle of the re-entering light. Figure 8 As shown, when the incident angle of the light emitted from the light source 120 and incident on the wavelength filter layer 300 is about 50° or even about 70°, the ratio of the light passing through the wavelength filter layer 300 to the reflected light may be about 7:3.

[0160] The figure only shows that the light emitted from the light source 120 travels approximately to the reference line L. 0 With the reference path line L M However, the traveling direction of the light emitted from the light source 120 is not limited thereto. At least a portion of the light emitted from the light source 120 may be traveling in a direction other than the reference line L. 0 With the reference path line L M direction, such as toward the reference path line L M Move in the outer direction.

[0161] Fig.11 is a cross-sectional view of a wavelength filtering layer according to an embodiment.

[0162] Fig.11 The embodiment illustrates that the wavelength filtering layer 300_1 may further include a wavelength filtering substrate 330 .

[0163] refer to Fig.11 The wavelength filtering substrate 330 may be disposed on the second refractive layer 320 disposed at the top in the third direction. The wavelength filtering substrate 330 may include a plastic film with high transmittance. For example, the wavelength filtering substrate 330 may be a PET film.

[0164] Although not shown, the wavelength filter substrate 330 may be disposed on the bottom surface of the first refractive layer 310. The wavelength filter substrate 330 is disposed on the upper side of the wavelength filter layer 300_1, so that the light emitted from the light source 120 can be emitted toward the display panel 70 through the top surface of the wavelength filter substrate 330. However, it is not limited thereto, and the wavelength filter substrate 330 may also be disposed on the lower side of the wavelength filter layer 300_1, and the light emitted from the light source 120 may be incident on the bottom surface of the wavelength filter substrate 330.

[0165] Figures 12 to 15is a cross-sectional view of a light source component, a reflective component, and a wavelength filtering layer according to other embodiments.

[0166] Fig.12 It is illustrated that the outer side surface AMso_12 of the bonding layer AM_12 may protrude further outward than the side surface 300s of the wavelength filter layer 300. Fig.12 As shown, the inner side surface AMsi_12 of the adhesive layer AM_12 is aligned with the side surface 210s of the reflective film 210, the adhesive layer AM_12 may extend further outward than the side surface 300s of the wavelength filter layer 300, and the outer side surface AMso_12 of the adhesive layer AM_12 may not be aligned with the side surface 300s of the wavelength filter layer 300 along the third direction Z.

[0167] The adhesive layer AM_12 contacts the top surface 210a of the reflective film 210. The entire bottom surface AMb_12 of the adhesive layer AM_12 contacts a portion of the top surface 210a of the reflective film 210. The wavelength filter layer 300 is formed by contacting the top surface AMa_12 of the adhesive layer AM_12. The wavelength filter layer 300 may expose a portion of the outer peripheral portion of the top surface AMa_12 of the adhesive layer AM_12. Although not shown in the figure, the adhesive layer AM_12 may cover the entire overlapping area of ​​the wavelength filter layer 300 and the reflective film 210 in the plan view, and extend in the outer direction of the opening 210h, so that the top surface 210a of the reflective film 210 exposed by the wavelength filter layer 300 may also be covered.

[0168] In the case of this embodiment, after the top surface 210a of the reflective film 210 without the opening 210h is patterned with the adhesive layer AM_12, ​​the opening 210h can be formed in the reflective film 210 by punching or other methods. Specifically, on the top surface 210a of the reflective film 210 without the opening 210h, the adhesive layer AM_12 can be arranged in a manner corresponding to the light source 120 along the third direction Z. The diameter of the adhesive layer AM_12 can be greater than the width 2W of the wavelength filter layer 300. 3 The wavelength filter layer 300 may be formed by punching or the like to include a width of 2W. 3 Small width 2W 2 The opening portion 210h is formed so that the reflective film 210 configured with the adhesive layer AM_12 corresponds to the light source 120 along the third direction Z.

[0169] Fig.13 The inner side surface AMsi_13 of the adhesive layer AM_13 is illustrated to protrude further inward than the side surface 210s of the reflective film 210. Fig.13As shown, the inner side surface AMsi_13 of the adhesive layer AM_13 covers the top surface 210a of the reflective film 210 and extends toward the inner side where the light source 120 is disposed, thereby covering a portion of the side surface 210s of the reflective film 210.

[0170] Specifically, the adhesive layer AM_13 may include: a top surface AMa_13, which is composed of a plane; bottom surfaces AMb_13a and AMb_13b, which are composed of two planes; inner side surface AMsi_13, which is composed of a plane; and outer side surfaces AMso_13 and AMsm_13, which are composed of two planes. The top surface AMa_13 of the adhesive layer AM_13 contacts the bottom surface 300b of the wavelength filter layer 300, and a part of the bottom surface AMb_13b of the adhesive layer AM_13 contacts the top surface 210a of the reflective film 210. The bottom surface AMb_13a of the adhesive layer AM_13 disposed on the side surface 210s of the reflective film 210 may be opposite to the reflective coating layer 220 disposed on the first substrate 110 along the third direction Z. The inner side surface AMsi_13 of the adhesive layer AM_13 may overlap with the reflective coating layer 220 disposed on the first substrate 110 along the third direction Z, and a portion of the outer side surface AMsm_13 of the adhesive layer AM_13 may contact with the side surface 210s of the reflective film 210 .

[0171] In the case of this embodiment, the adhesive layer AM_13 may be formed when the top surface 210a of the reflective film 210 where the opening 210h is formed is coated. Specifically, the adhesive layer AM_13 may be arranged around the opening 210h in the top surface 210a of the reflective film 210. At this time, the adhesive layer AM_13 may be arranged to a part of the area of ​​the opening 210h arranged in the reflective film 210, so that a part of the side surface 210s of the reflective film 210 may be covered.

[0172] Fig.14 The example shows that the adhesive layer AM_14 can be disposed on the entire top surface 210a of the reflective film 210 except the opening 210h. Fig.14 As shown, the adhesive layer AM_14 may cover the entire top surface 210 a of the reflective film 210 exposed through the wavelength filtering layer 300 .

[0173] The inner side surface AMsi_14 of the adhesive layer AM_14 may be aligned with the side surface 210s of the reflective film 210 along the third direction Z. The adhesive layer AM_14 extends outward from the side surface 300s of the wavelength filter layer 300 and may be arranged until the side surface of the reflective film 210 formed by the adjacent opening (not shown). Therefore, in the case of this embodiment, the outer side surface of the adhesive layer AM_14 may not be formed.

[0174] The adhesive layer AM_14 contacts the top surface 210a configured on the reflective film 210. The entire bottom surface AMb_14 of the adhesive layer AM_14 may contact the entire top surface 210a of the reflective film 210. The wavelength filter layer 300 is formed in contact with the top surface AMa_14 of the adhesive layer AM_14. The wavelength filter layer 300 may expose a portion of the top surface AMa_14 of the adhesive layer AM_14. The top surface AMa_14 of the adhesive layer AM_14 exposed by the wavelength filter layer 300 may overlap with the reflective film 210 exposed by the wavelength filter layer 300 along the third direction Z.

[0175] In the case of this embodiment, after the adhesive layer AM_14 is fully configured on the top surface 210a of the reflective film 210 without the opening 210h, the opening 210h can be configured on the reflective film 210 by punching or other methods. Specifically, the adhesive layer AM_14 can be fully configured on the top surface 210a of the reflective film 210 without the opening 210h. The area of ​​the adhesive layer AM_14 can be less than or equal to the area of ​​the reflective film 210. The width 2W of the wavelength filter layer 300 can be formed by punching or other methods. 3 Small width 2W 2 The opening portion 210h is formed so that the reflective film 210 configured with the adhesive layer AM_14 corresponds to the light source 120 along the third direction Z.

[0176] Fig.15 The bonding layer AM_15 can be fully configured on the bottom surface 300b of the wavelength filter layer 300. For example, Fig.15 As shown, the outer side surface AMso_15 of the adhesive layer AM_15 is aligned with the side surface 300s of the wavelength filter layer 300, and the inner side surface of the adhesive layer AM_15 may not be formed.

[0177] The adhesive layer AM_15 is configured to contact the bottom surface 300b of the wavelength filter layer 300. The entire top surface AMa_15 of the adhesive layer AM_15 can contact the entire bottom surface 300b of the wavelength filter layer 300. The peripheral portion of the bottom surface AMb_15 of the adhesive layer AM_15 is in contact with the top surface 210a of the reflective film 210, and the opening 210h area of ​​the bottom surface AMb_15 of the adhesive layer AM_15 can be configured opposite to the first substrate 110.

[0178] In the present embodiment, after the adhesive layer AM_15 is fully coated on one side of the wavelength filter layer 300, a predetermined width 2W is formed. 3After patterning, the surface on which the adhesive layer AM_15 is disposed can be disposed in contact with the top surface 210a of the reflective film 210. In this case, when the adhesive layer AM_15 is formed of a light-transmitting material, light emitted from the light source 120 can be incident on the wavelength filter layer 300 side without light loss.

[0179] Fig.16 1 is an exploded perspective view showing the relative positional relationship among a light source component, a reflective component and a wavelength filter layer according to another embodiment. Fig.17 is along Fig.16 Cross-sectional view taken along line XVII-XVII'. Fig.16 and Fig.17 A portion of the backlight unit 10 configured corresponding to one light source 120 is shown.

[0180] refer to Fig.16 and Fig.17 , this embodiment and Figure 6 The difference of the embodiment is that a second reflective film 230 is further included above the wavelength filter layer 300. Specifically, the reflective component 200_16 includes a first reflective film 210, a reflective coating layer 220, and a second reflective film 230. From the perspective of the configuration of each component, in this embodiment, Figure 6 The reflective film 210 may be replaced by the first reflective film 210 , and the opening 210 h may be replaced by the first opening 210 h .

[0181] The second reflective film 230 may be disposed above the first reflective film 210. The second reflective film 230 may have a shape substantially similar to that of the first reflective film 210. For example, in the case where the first reflective film 210 has a rectangular planar shape, the second reflective film 230 may also have a similar rectangular planar shape. Although not shown in the figure, the size of the first reflective film 210 and the size of the second reflective film 230 in the plan view may be substantially the same, but are not limited thereto.

[0182] The second reflective film 230 may include at least one second opening 230h, similar to the first reflective film 210. The second opening 230h may be formed by completely penetrating the second reflective film 230. The second opening 230h may be cylindrical with a predetermined radius and a predetermined height. In the illustrated embodiment, the diameter of the second opening 230h may be 2W the same as the width of the first opening 210h formed in the first reflective film 210. 2 Similarly, the height of the second opening 230 h may be the same as the height of the second reflective film 230 .

[0183] The first reflective film 210 and the second reflective film 230 may be arranged spaced apart in the third direction Z. The top surface of the first reflective film 210 and the bottom surface of the second reflective film 230 may face each other. The top surface of the first reflective film 210 and the bottom surface of the second reflective film 230 may be arranged in a substantially parallel manner.

[0184] Width 2W 2 The same first opening 210h and second opening 230h may be arranged uniformly along the third direction Z. The plane where the side surface 210s of the first reflective film 210 is located and the plane where the side surface 230s of the second reflective film 230 is located may be aligned along the third direction Z. That is, the second opening 230h is configured on the second reflective film 230 in a one-to-one correspondence with one light source 120, just like the first opening 210h. Therefore, the second opening 230h may completely expose the light source 120 along the third direction Z.

[0185] A wavelength filter layer 300 may be disposed in the space between the first reflective film 210 and the second reflective film 230 in the third direction Z. The wavelength filter layer 300 may overlap the first opening 210h and / or the second opening 230h in the thickness direction. 3 It can be larger than the width 2W of the first opening 210h and the second opening 230h. 2 Therefore, the first reflective film 210 and the second reflective film 230 at least partially overlap with the peripheral portion of the wavelength filter layer 300 along the third direction Z.

[0186] Adhesive layers AM1 and AM2 may be further provided between the wavelength filter layer 300 and the first reflective film 210 and / or between the wavelength filter layer 300 and the second reflective film 230. The first adhesive layer AM1 may be provided between the wavelength filter layer 300 and the first reflective film 210, and the second adhesive layer AM2 may be provided between the wavelength filter layer 300 and the second reflective film 230.

[0187] The first adhesive layer AM1 disposed between the wavelength filter layer 300 and the first reflective film 210 may include a top surface AM1a, a bottom surface AM1b, an inner side surface AM1si, and an outer side surface AM1so. Similarly, the second adhesive layer AM2 disposed between the wavelength filter layer 300 and the second reflective film 230 may include a top surface AM2a, a bottom surface AM2b, an inner side surface AM2si, and an outer side surface AM2so.

[0188] The bottom surface AM1b of the first adhesive layer AM1 is placed on the first reflective film 210. The top surface AM1a of the first adhesive layer AM1 may be opposite to the bottom surface AM1b of the first adhesive layer AM1. The top surface AM1a and the bottom surface AM1b of the first adhesive layer AM1 are respectively located on a plane, and the planes where the top surface AM1a and the bottom surface AM1b of the first adhesive layer AM1 are located are approximately parallel, so that the thickness can be uniform as a whole. The plane where the side surfaces AM1si and AM1so of the first adhesive layer AM1 are located may form an angle of about 90° with the plane where the top surface AM1a and / or the bottom surface AM1b of the first adhesive layer AM1 are located.

[0189] The top surface AM1a of the first adhesive layer AM1 may contact the bottom surface of the wavelength filter layer 300. The top surface AM1a of the first adhesive layer AM1 may be disposed at a peripheral portion of the wavelength filter layer 300 and overlap a portion of the wavelength filter layer 300 along the third direction Z.

[0190] The bottom surface AM2b of the second adhesive layer AM2 is placed on the wavelength filtering layer 300. The top surface AM2a of the second adhesive layer AM2 may be opposite to the bottom surface AM2b of the second adhesive layer AM2. The top surface AM2a and the bottom surface AM2b of the second adhesive layer AM2 are respectively located on a plane, and the planes where the top surface AM2a and the bottom surface AM2b of the second adhesive layer AM2 are located are approximately parallel, so that the thickness can be uniform as a whole. The plane where the side surfaces AM2si and AM2so of the second adhesive layer AM2 are located and the plane where the top surface AM2a and / or the bottom surface AM2b of the second adhesive layer AM2 are located may form an angle of about 90°.

[0191] The bottom surface AM2b of the second adhesive layer AM2 may be in contact with the top surface of the wavelength filter layer 300. The bottom surface AM2b of the second adhesive layer AM2 may be disposed at the peripheral portion of the wavelength filter layer 300 and overlap with a portion of the wavelength filter layer 300 along the third direction Z. The top surface AM2a of the second adhesive layer AM2 may be in contact with the bottom surface of the second reflective film 230. The top surface AM2a of the second adhesive layer AM2 may be disposed at and in contact with a portion of the bottom surface of the second reflective film 230. That is, the second adhesive layer AM2 overlaps with a portion of the second reflective film 230 along the third direction Z.

[0192] The first adhesive layer AM1 and the second adhesive layer AM2 may be configured to completely cover the overlapping area of ​​the first reflective film 210, the second reflective film 230 and the wavelength filter layer 300 along the third direction Z. Therefore, the width of the first adhesive layer AM1 and the second adhesive layer AM2 may be equal to the radius W of the wavelength filter layer 300. 3 and the radius W of the opening 210h 2 difference.

[0193] refer to Fig.17, the inner side surface AM1si of the first adhesive layer AM1 and the inner side surface AM2si of the second adhesive layer AM2 can be aligned along the third direction Z, and the outer side surface AM1so of the first adhesive layer AM1 and the outer side surface AM2so of the second adhesive layer AM2 can be aligned along the third direction Z. Therefore, the inner side surface AM1si of the first adhesive layer AM1, the inner side surface AM2si of the second adhesive layer AM2, the side surface 210s of the first reflective film 210, and the side surface 230s of the second reflective film 230 can be aligned along the third direction Z. In addition, the outer side surface AM1so of the first adhesive layer AM1, the outer side surface AM2so of the second adhesive layer AM2, and the side surface 300s of the wavelength filter layer 300 can be aligned along the third direction Z.

[0194] The second reflective film 230 is disposed on the first reflective film 210 , thereby preventing the light emitted from the light source 120 from being visible to the outside.

[0195] Fig.18 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment. Fig.18 and Fig.17 The embodiment of the present invention is different in that the size of the second opening 230h_18 of the second reflection film 230_18 disposed on the reflection member 200_18 is different from that of the first opening 210h.

[0196] Specifically, the diameter of the second opening 230h_18 may be 2W greater than the width of the first opening 210h. 2 Larger, and can be larger than the width of the wavelength filter layer 300 by 2W 3 The second opening 230h_18 may expose at least a portion of the overlapping region of the first reflective film 210 and the wavelength filter layer 300 in the thickness direction. Therefore, the width of the top surface of the wavelength filter layer 300 exposed by the second opening 230h_18 may be 2W greater than the width of the first opening 210h. 2 Larger than the width of the wavelength filter layer 300 2W 3 Small.

[0197] The side surface 210s of the first reflective film 210 and the inner side surface AM1si of the first adhesive layer AM1 can be aligned along the third direction Z, and the side surface 230s_18 of the second reflective film 230_18 and the inner side surface AM2si_18 of the second adhesive layer AM2_18 can be aligned along the third direction Z. However, due to the diameter of the second opening 230h_18 and the width 2W of the first opening 210h 2Differently, the side surface 210 s of the first reflective film 210 and the side surface 230 s_18 of the second reflective film 230_18 may not be aligned along the third direction Z. Specifically, the side surface 230 s_18 of the second reflective film 230_18 may be disposed further outward than the side surface 210 s of the first reflective film 210 .

[0198] As in the case of the present embodiment, the diameter of the second opening 230h_18 formed in the second reflective film 230_18 is formed to be 2W larger than the width of the first opening 210h formed in the first reflective film 210. 2 The wavelength filter layer 300 is large, thereby preventing the light emitted from the wavelength filter layer 300 to the display panel 70 side from being visible to the outside.

[0199] Fig.19 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment. Fig.19 and Fig.17 The difference of the embodiment is that no adhesive layer is arranged between the first reflective film 210 and the second reflective film 230 of the reflective component 200_19.

[0200] Specifically, the bottom surface of the wavelength filter layer 300 may be disposed on the first reflective film 210. The bottom surface of the wavelength filter layer 300 may be in contact with the top surface of the first reflective film 210. The second reflective film 230 may be disposed on the wavelength filter layer 300. The top surface of the wavelength filter layer 300 may be in contact with the bottom surface of the second reflective film 230. The width of the bottom surface of the wavelength filter layer 300 and the top surface of the first reflective film 210 directly contacting the top surface of the wavelength filter layer 300 and the bottom surface of the second reflective film 230 may be the same as each other.

[0201] In this embodiment, although there is no adhesive layer between the first reflective film 210, the second reflective film 230 and the wavelength filter layer 300, the first reflective film 210 and the second reflective film 230 are arranged to overlap each other along the third direction Z, and the wavelength filter layer 300 is arranged between the first reflective film 210 and the second reflective film 230, so that the wavelength filter layer 300 can be fixed. Although not shown in the figure, the first reflective film 210 and the second reflective film 230 can be fixed by an adhesive or the like at the peripheral portion of the space separated between the first reflective film 210 and the second reflective film 230 along the third direction Z. Not limited to this, the first reflective film 210 and the second reflective film 230 can be fixed to the side wall (not shown) of the housing 80 by an adhesive tape (not shown).

[0202] Fig. 20 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment. Fig. 20 and Fig.19The difference of the embodiment is that an adhesive layer AM_20 is arranged between the first reflective film 210 and the second reflective film 230 of the reflective component 200_20.

[0203] Specifically, an adhesive layer AM_20 may be disposed on the first reflective film 210. The bottom surface of the adhesive layer AM_20 may be in contact with the top surface of the first reflective film 210. The adhesive layer AM_20 may be disposed in a region where the first reflective film 210 and the wavelength filter layer 300 do not overlap along the third direction Z. Therefore, the plane where the bottom surface of the adhesive layer AM_20 is located and the plane where the bottom surface of the wavelength filter layer 300 is located may be substantially the same plane.

[0204] The second reflective film 230 may be disposed on the adhesive layer AM_20. The top surface of the adhesive layer AM_20 may contact the bottom surface of the second reflective film 230. The adhesive layer AM_20 may contact the bottom surface of the second reflective film 230 in a region where the second reflective film 230 and the wavelength filter layer 300 do not overlap along the third direction Z. Therefore, the plane where the top surface of the adhesive layer AM_20 is located and the plane where the top surface of the wavelength filter layer 300 is located may be substantially the same plane.

[0205] The side surface of the adhesive layer AM_20 may contact the side surface of the wavelength filter layer 300. That is, the wavelength filter layer 300 and the adhesive layer AM_20 may completely cover the top surface of the first reflective film 210 exposed through the wavelength filter layer 300.

[0206] In this embodiment, the adhesive layer AM_20 can be disposed between the first reflective film 210 and the second reflective film 230 instead of between the first reflective film 210 and the second reflective film 230 and the wavelength filter layer 300, so that the wavelength filter layer 300 can be fixed to the first reflective film 210 and the second reflective film 230 in a sandwich structure.

[0207] Fig.21 1 is a configuration diagram showing the relative positional relationship of a light source, a reflective component, and a wavelength filter layer according to another embodiment. Fig. 22 is along Fig.21 A schematic cross-sectional view of the light source, reflective component and wavelength filter layer cut along line XXII-XXII'.

[0208] refer to Fig.21 and Fig. 22 ,and Figure 3 The difference of the embodiment is that the wavelength filter layer 300_21 according to this embodiment is fully configured on the reflective film 210 in a manner including all the multiple light sources 120 configured on the first substrate 110.

[0209] Specifically, the wavelength filter layer 300_21 can be disposed on the reflective film 210 in a manner that can include all of the plurality of light sources 120 disposed at the bottom of the wavelength filter layer 300_21. Therefore, the wavelength filter layer 300_21 can be disposed to overlap all of the plurality of light sources 120 disposed on the first substrate 110.

[0210] like Fig. 22 As shown, the wavelength filter layer 300_21 may be configured to overlap with the top surface of the reflective film 210 configured on the first substrate 110. The side surface of the wavelength filter layer 300_21 may overlap with a portion of the reflective film 210 configured around the top surface of the first substrate 110 in the thickness direction. In addition, an adhesive layer AM_21 may be configured between the fully configured wavelength filter layer 300_21 and the reflective film 210. Therefore, the adhesive layer AM_21 may be fully configured in the region where the wavelength filter layer 300_21 and the reflective film 210 overlap along the third direction Z.

[0211] In the case of this embodiment, the wavelength filter layer 300_21 is not patterned in a manner corresponding to the individual light sources 120, but is formed in one piece. Therefore, although it is difficult to save material costs according to patterning, the patterning process can be omitted, which has an advantage in process efficiency. Further, the wavelength filter layer 300_21 can block a portion of the heat that may be emitted from the light source 120 from reaching the heat-fragile diffusion plate 400 disposed above the wavelength filter layer 300_21, thereby also preventing the heat-fragile diffusion plate 400 from being damaged by the heat generated from the light source 120.

[0212] Fig.23 1 is a configuration diagram showing the relative positional relationship among a light source, a first reflection film, a second reflection film, and a wavelength filter layer according to still another embodiment. Fig.24 is an exploded perspective view showing the relative positional relationship among a light source component, a reflective component and a wavelength filter layer corresponding to one light source according to yet another embodiment. Fig.25 is along Fig.23 Cross-sectional view of the XXV-XXV' line cutting. Fig.26 is from Fig.25 An enlarged view of a portion in which a light source is configured in an enlarged manner in a cross-sectional view of FIG. Fig.24 and Fig.26 A portion of the backlight unit 10 arranged corresponding to one light source 120 is shown.

[0213] and Figure 3 The difference of the embodiment is that Figure 23 to Figure 26In the embodiment of the present invention, a portion of the backlight unit 10 further includes a second reflective film 230_23 patterned on the top surface of the wavelength filter layer 300. In the present embodiment, the reflective component 200_23 includes a first reflective film 210, a reflective coating layer 220, and a second reflective film 230_23. From the perspective of the configuration of each component, in the present embodiment, Figure 3 The reflective film 210 may be replaced by the first reflective film 210 , and the opening 210 h may be replaced by the first opening 210 h .

[0214] refer to Figure 23 to Figure 26 The second reflective film 230_23 may include a plurality of second reflective films 230_23. Each second reflective film 230_23 may include a second opening 230h_23. The second opening 230h_23 may be formed by completely penetrating the second reflective film 230_23. The second opening 230h_23 may have a predetermined radius W. 4 and the predetermined height h 4 The height h of the second opening 230h_23 is 4 The height h of the second reflective film 230_23 may be 4 The shape of the second reflective film 230_23 is a predetermined radius W. 5 and the predetermined height h 4 The cylindrical configuration has a predetermined radius W 4 and the predetermined height h 4 The second reflective film 230_23 may be configured to have an outer diameter W in a plan view. 5 and inner diameter W 4 However, it is not limited thereto, the plane shape of the second reflective film 230_23 may be a square, an ellipse, a rectangle or other shapes, and the plane shape of the second opening 230h_23 may be a square, an ellipse, a rectangle or other shapes different from the plane shape of the second reflective film 230_23.

[0215] The second reflective film 230_23 including the second opening 230_23h may be disposed on the top surface of the wavelength filter layer 300. That is, the second reflective film 230_23 may be disposed corresponding to each of the individual light sources 120.

[0216] The width of the second reflective film 230_23 is 2W 5 Greater than the width 2W of the wavelength filter layer 300 3 , the width of the second opening 230h_23 is 2W 4 The width 2W of the first opening 210h may be 3That is, the second opening 230h_23 may have the same area as the first opening 210h. Therefore, the second reflective film 230_23 may be configured to surround the light source 120 in a plan view, so that the light source 120 is completely exposed along the third direction Z through the second opening 230h_23.

[0217] refer to Fig.26 The second reflective film 230_23 includes an inner side surface 230si_23 forming a second opening 230h_23 in the cross-sectional view and an outer side surface 230so_23 arranged in the outer direction of the second opening 230h_23. The inner side surface 230si_23 of the second reflective film 230_23 may be aligned with a plane including the inner side surface 210si of the first reflective film 210 along the third direction Z. The outer side surface 230so_23 of the second reflective film 230_23 may be arranged to extend further outward than the side surface of the wavelength filter layer 300. The second reflective film 230_23 may overlap a portion of the first reflective film 210 along the third direction Z.

[0218] Fig. 27 is a cross-sectional view of a light source component, a reflective component and a wavelength filtering layer according to yet another embodiment.

[0219] In a portion of the backlight unit 10 according to the present embodiment, Fig. 27 and Fig.26 The difference of the embodiment is that the width 2W4_27 of the second opening 230h_27 formed on the second reflective film 230_27 is different from the width 2W4_27 of the first opening 210h formed on the first reflective film 210. 2 different.

[0220] refer to Fig. 27 More specifically, the width 2W of the second opening 230h_27 formed on the second reflective film 230_27 is 4 _27 may be equal to the width 2W of the first opening 210h formed on the first reflective film 210. 2 The width 2W of the second opening 230h_27 formed on the second reflective film 230_27 is different. 4 _27 may be greater than the width 2W of the first opening 210h formed on the first reflective film 210. 2 Therefore, the second reflective film 230_27 forming the second opening portion 230h_27 may expose the wavelength filter layer 300 along the third direction Z and at least a portion of the wavelength filter layer 300 overlapping the first reflective film 210 along the third direction Z.

[0221] Fig. 27In the figure, adhesive layers AM1 and AM2_27 are arranged between the first reflective film 210 and the wavelength filter layer 300, and between the second reflective film 230_27 and the wavelength filter layer 300, so as to fix the first reflective film 210, the wavelength filter layer 300 and the second reflective film 230_27, but it is not limited to this. The adhesive layers AM1 and AM2_27 may not be arranged between the first reflective film 210, the second reflective film 230_27 and the wavelength filter layer 300.

[0222] Fig.28 It is a cross-sectional view of a light source component, a reflective component, a wavelength filter layer, and a diffusion plate according to another embodiment.

[0223] In the backlight unit 10 according to this embodiment, a plurality of reflective patterns 450 may be disposed between the diffusion plate 400 and the wavelength filter layer 300. In one embodiment, the reflective pattern 450 may be a reflective ink pattern composed of ink. In other embodiments, the reflective pattern 450 may be composed of a film.

[0224] A plurality of reflection patterns 450 may be formed on the bottom surface of the diffusion plate 400. The widths of the reflection patterns 450 may be the same as each other. However, not limited thereto, the widths of the reflection patterns 450 may be different from each other.

[0225] The reflective pattern 450 may be formed on the diffusion plate 400 by printing, but is not limited thereto. The reflective pattern 450 may be made of a material having a reflective property, such as metal or titanium oxide (TiO 2 ), dichroic dyes, etc., but are not limited to these.

[0226] Each reflection pattern 450 may be arranged spaced apart from each other along the second direction Y. The distances at which the plurality of reflection patterns 450 are spaced apart along the second direction Y may be different from each other. In one embodiment, a reflection pattern 450 having a first distance from the light source 120 may be different from a reflection pattern 450 having a second distance from the light source 120. The second distance may be greater than the first distance. The spacing of the reflection pattern 450 having the first distance from the light source 120 may be less than the spacing of the reflection pattern 450 having the second distance from the light source 120. Therefore, the farther away from the corresponding light source 120, the larger the spacing of the reflection pattern 450 may be.

[0227] The farther the distance between the multiple reflection patterns 450 is from the corresponding light source 120, the larger the reflection patterns 450 are configured, so that the light emitted from the light source 120 and emitted from the wavelength filter layer 300 has the lowest transmittance in the central part of the opening 210h, and the transmittance may be high at the edge of the reflective film 210.

[0228] The reflective pattern 450 disposed on the bottom surface of the diffusion plate 400 prevents most of the light emitted from the light source 120 from traveling vertically upward and incident on the display panel 70. Therefore, the reflective pattern 450 allows the light emitted from the light source 120 to be provided to the display panel 70 with more uniform brightness.

[0229] The embodiments of the present disclosure are described above with reference to the attached drawings. A person with general knowledge in the technical field of the present disclosure should understand that the present disclosure can be implemented in other specific forms without changing the technical ideas and essential features of the present disclosure. Therefore, it should be understood that the embodiments described above are only illustrative in all aspects and are not restrictive.

Claims

1. A backlight unit, wherein: include: a first substrate; A plurality of light sources are disposed on one surface of the first substrate and emit light in a first wavelength band; A first reflective film, disposed on one surface of the first substrate, comprising a first opening portion exposing each of the light sources; a plurality of wavelength filter layers, disposed on the first reflective film and corresponding to the first opening; as well as a wavelength conversion film, disposed above the wavelength filter layer, for converting light in the first wavelength band into light in a second wavelength band different from the first wavelength band, The wavelength filter layer is formed by stacking a plurality of refractive layers with different refractive indices. The plurality of wavelength filtering layers are arranged to be spaced apart from each other. Each wavelength filter layer covers at least one of the first openings, The wavelength filter layer has a first transmittance with respect to light in a first incident angle range, and has a second transmittance greater than the first transmittance with respect to light in a second incident angle range greater than the first incident angle range.

2. The backlight unit according to claim 1, wherein: The wavelength filter layer has different transmittances according to the wavelength of the incident light and the incident angle based on the normal direction.

3. The backlight unit according to claim 1, wherein: The wavelength filter layer has a width greater than a width of the first opening portion covered by the layer.

4. The backlight unit according to claim 3, wherein: The wavelength filtering layer completely covers the first opening and overlaps with the first reflecting film around the first opening.

5. The backlight unit according to claim 1, wherein: The first opening surrounds each of the light sources. The thickness of the first reflective film is greater than the thickness of the light source.

6. The backlight unit according to claim 1, wherein: The spacing distance between adjacent wavelength filter layers is greater than the width of the wavelength filter layer.

7. The backlight unit according to claim 1, wherein: Also includes: The second reflective film is disposed on the wavelength filter layer and includes a second opening portion overlapping the first opening portion.

8. The backlight unit according to claim 1, wherein: Also includes: The diffusion plate is arranged above the wavelength filtering layer.

9. The backlight unit according to claim 8, wherein: It also includes a plurality of reflection patterns arranged on the bottom surface of the diffusion plate, A pitch of the reflection patterns having a first distance from the light source is smaller than a pitch of the reflection patterns having a second distance from the light source that is greater than the first distance.

Images